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POWER LOSS & SUPPLY FAULT GUIDE

No Power in One Room

Power loss in one room often comes from a tripped breaker, failed socket or lighting circuit, upstream fused spur, loose connection or damaged cable.

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Stop if there is heat, burning, arcing, exposed parts or damaged supply equipment

Do not remove consumer-unit covers, open electricity meters, disturb sealed cut-outs or touch exposed conductors. Leave affected equipment off and contact a registered electrician, supplier or network operator as appropriate.

MOST LIKELY CAUSES

Start with these

Tripped circuit breaker One room may sit on a dedicated or shared circuit.
Local circuit fault A loose line or neutral can disconnect several points.
Upstream fused spur Extensions and converted rooms may be supplied through an FCU.
Recent damage or work Drilling, screws or renovation may have damaged the circuit.
◫ Symptom variations Match the exact pattern before testing. ⌄
  • Sockets and lights both dead
  • Only sockets are dead
  • Only lights are dead
  • One side of the room has power
  • Fault started after DIY or building work
✓ Quick checks Safe checks using front-panel controls and visible information only. ⌄
  1. Check whether the whole property or only certain rooms are affected.
  2. Look for a wider local outage.
  3. Inspect the consumer unit for a tripped breaker, RCBO, RCD or main device.
  4. Check the electricity meter display and prepayment status where applicable.
  5. Attempt one controlled reset only if there are no danger signs.
If power returns: reconnect or restore loads gradually and monitor the supply.
If the fault remains: leave affected circuits off and arrange the correct professional response.
1 Fix 1 — Identify what is affected Follow this check without opening live or sealed electrical equipment. ⌄

Process

Check whether sockets, lights or both have failed.

Success looks like: The fault is narrowed to one circuit type.
Failure means: If both are dead, more than one circuit or a local supply may be involved.
2 Fix 2 — Check protective devices Follow this check without opening live or sealed electrical equipment. ⌄

Process

Inspect the consumer unit and reset one operated device once.

Success looks like: Power returns and remains stable.
Failure means: If it trips again, leave it off.
3 Fix 3 — Check local fused spurs Follow this check without opening live or sealed electrical equipment. ⌄

Process

Look for accessible FCUs supplying converted rooms, garages or extensions.

Success looks like: The local supply is restored.
Failure means: If not, circuit tracing is required.
⌁ Common causes explained Why the power or supply may fail. ⌄

Power loss in one room often comes from a tripped breaker, failed socket or lighting circuit, upstream fused spur, loose connection or damaged cable.

Power loss can originate inside the property, at the meter, or on the electricity network. Identifying which protective device operated and how much of the property is affected is the quickest way to narrow it down.

⌘ Advanced diagnostics Technician-level testing for a competent electrician. ⌄
  • Test voltage and continuity on affected circuits.
  • Inspect ring, radial and lighting junctions.
  • Check for lost neutrals and damaged conductors.
  • Trace upstream fused spurs and local distribution.
  • Carry out insulation-resistance testing.
▣ Parts that may need replacing Components commonly linked to this fault. ⌄
  • Breaker or RCBO after testing
  • Fused spur
  • Socket or switch
  • Junction or connector
  • Damaged cable
! When to call an electrician or supply provider Conditions that should end DIY troubleshooting. ⌄
  • The fault remains after one controlled reset.
  • There is burning, heat, buzzing, crackling or visible damage.
  • The main switch, RCD or breaker will not stay on.
  • The meter or sealed supply equipment appears damaged.
  • Lights become unusually bright or voltage appears unstable.
  • Only your property is affected and no internal protective device has operated.
? Frequently asked questions Common questions about supply faults. ⌄

Who should I call for a complete power outage?

Check whether neighbours are affected. A wider outage belongs to the electricity network operator; a fault limited to your installation may need an electrician.

Can a faulty appliance cut power to several rooms?

Yes. One appliance can trip an RCD that protects several circuits.

Should I repeatedly reset the main switch or RCD?

No. One controlled reset is enough to establish whether the fault remains.